Bridesmaid delema!

Elizabeth
K so my family is crazy i have 3 sisters who dont like each other over some random crap. Iv got my maid of honor but im stuck i want to have my niece b a bridesmaid mostly cuz i would like some sort of family in my bridal party but the last spot has been given me hell would it b rude of me to just leave all 3 sisters out and pick another friend to b in my wedding?